WO2000033622A2 - Improved heat sink and process of manufacture - Google Patents

Improved heat sink and process of manufacture Download PDF

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Publication number
WO2000033622A2
WO2000033622A2 PCT/US1999/025193 US9925193W WO0033622A2 WO 2000033622 A2 WO2000033622 A2 WO 2000033622A2 US 9925193 W US9925193 W US 9925193W WO 0033622 A2 WO0033622 A2 WO 0033622A2
Authority
WO
WIPO (PCT)
Prior art keywords
base plate
tubes
array
heat sink
holes
Prior art date
Application number
PCT/US1999/025193
Other languages
French (fr)
Other versions
WO2000033622A9 (en
WO2000033622A3 (en
Inventor
Ronald D. Bargman
Ioslav Umanskly
Original Assignee
Bargman Ronald D
Ioslav Umanskly
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bargman Ronald D, Ioslav Umanskly filed Critical Bargman Ronald D
Priority to AU35799/00A priority Critical patent/AU3579900A/en
Publication of WO2000033622A2 publication Critical patent/WO2000033622A2/en
Publication of WO2000033622A3 publication Critical patent/WO2000033622A3/en
Publication of WO2000033622A9 publication Critical patent/WO2000033622A9/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/20—Making uncoated products by backward extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K23/00—Making other articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K25/00—Uniting components to form integral members, e.g. turbine wheels and shafts, caulks with inserts, with or without shaping of the components
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
    • H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
    • H01L21/4814—Conductive parts
    • H01L21/4871—Bases, plates or heatsinks
    • H01L21/4878—Mechanical treatment, e.g. deforming
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
    • H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
    • H01L21/4814—Conductive parts
    • H01L21/4871—Bases, plates or heatsinks
    • H01L21/4882—Assembly of heatsink parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
    • H01L23/367—Cooling facilitated by shape of device
    • H01L23/3677—Wire-like or pin-like cooling fins or heat sinks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
    • H01L23/467—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing gases, e.g. air
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making

Definitions

  • the pins are formed by forging, but this process can produce only limited height pins, which in turn limits the ability of the structure to function to dissipate heat.
  • Another drawback of the forging process is that it is difficult to provide varying height pins in an array. It has heretofore been recognized that higher fins or pins at the center of an array may be desirable, as the center area typically tends to be hotter. It is an object of the present invention to provide an improved method of manufacturing a tube array heat sink and an improved heat sink which allows rapid and economical manufacture, while allowing higher and variable height tubular elements, as well as enabling chimney effect air flow through the tubes.
  • the material of the plugs is reversely extruded past the pins in being confined by the bore walls, forming a series of hollow or tubular cylinders, closed at one end.
  • a punching process may be also be carried out, forming through holes into the closed end of each tube, creating an open ended array of tubes integral with the base plate, which openings extend completely through the base plate to the opposite side thereof.
  • a groove pattern may be formed into the opposite side of the plate, preferably during the extrusion of the plugs.
  • the grooves intersect with the holes through the base and tubes, and allow air heated by the structure against which the plate is abutted to flow into and up the tubes by a convection effect.
  • a heat sink comprised of an array of pins or tubes extending from a base plate to a greater height then heretofore possible may be quickly and economically manufactured.
  • Varying height tubes may also be produced.
  • a chimney effect may optionally be provided in the tubes without requiring machining of holes in the sidewalk of the tubes by the effect of the groove pattern in the base plate under surface.
  • the tubes may also be assembled to the base and attached by a mechanical connection. Grooves in the base plate allow air flow into the tubes, and a separate channel member can provide air flow passages for the same purpose.
  • Figure 1 is sectional view of a simplified representation of tooling and a metal block in position to be reverse extruded in manufacturing a heat sink.
  • Figure 2 is a sectional view of the tooling shown in Figure 1 with the block extruded into an intermediate form.
  • Figure 3 is a sectional view of the part shown being extruded in Figure 3.
  • Figure 4 is bottom plan view of a part shown in Figure 3.
  • Figure 5 is a sectional view of additional tooling in which a reverse extrusion step is executed causing the pins or plugs initially formed to be reverse extruded to form extended length tubes closed at one end.
  • Figure 6 is a sectional view of the part formed in the extruding step shown in Figure 5.
  • Figure 7 is a sectional view of additional tooling for punching out the closed end of the tubes and forming corresponding holes through the base plate from which the tubes project.
  • Figure 8 is a sectional view of a version of the heat sink according to the present invention produced in the tooling shown in Figure 7.
  • Figure 9 is a bottom plan view of the heat sink shown in Figure 8.
  • Figure 10 is a perspective view of the heat sink shown in Figure 8.
  • Figure 11 is a sectional view of a simplified version of the heat sink.
  • Figure 12 is a perspective view of the part shown in Figure 11.
  • Figure 13 is a plan view of the bottom of the heat sink shown in Figures 1 1 and 12.
  • Figure 14 is a perspective view of a partially formed base plate for use in an assembled version of the heat sink according to the invention.
  • Figure 15 is a perspective view of the base plate shown in Figure 14 with a series of holes formed in the base plate.
  • Figure 16 is a plan bottom view of the base plate shown in Figure 15.
  • Figure 17 is a sectional view of a tubular rivet used to form the tubes in the heat sink according to the invention.
  • Figure 18 is a sectional view of a fragmentary portion of a base plate with a tubular rivet crimped in position.
  • Figure 19 is a perspective view of a completed assembled version of the heat sink according to the present invention.
  • Figure 20 is an exploded perspective view of a second embodiment of the assembled version of the heat sink.
  • Figure 21 is a fragmentary sectional view of an assembled tube and plate.
  • Figure 22 is a fragmentary perspective view of the second embodiment of the assembled version of the heat sink.
  • Figure 23 is a perspective view of an assembled tube array heat sink in which air flow passages are added by installation of the base plate onto a channel member.
  • Figure 24 is a transverse sectional view of the channel member used in the heat sink shown in Figure 23.
  • Figure 25 is a perspective view of the heat sink embodiment shown in Figure 23 with tube arrays ganged together.
  • Figure 26 is a transverse sectional view of an alternate form of the base plate and channel member.
  • Figure 27 is a sectional view of an installed snap-in rivet configuration.
  • Figure 28 is a sectional view of an offset plate rivet connection.
  • Figure 29 is a perspective view of a slotted head rivet configuration.
  • Figure 30 is a sectional view of a slotted head rivet installation.
  • Figure 31 is an elevational view of a heat sink with a varying height tube array in a heat sink.
  • Figure 32 is a plan view of the heat sink shown in Figure 31.
  • Figure 33 is a fragmentary perspective view of the heat sink shown in Figures 31 and 32.
  • a block 10 of the metal is placed on a pedestal 12 positioned below a confining member 14 mounting a die 16 formed with an array of holes 18 having suitable entryways 20 adjacent its lower face.
  • the material of the block 10 is extruded upwardly into the holes 18 as the die 16 and confining member 14 descend under very high ram pressure to compress the block 10.
  • An intermediate part 22 is thereby formed ( Figure 3), having array of cylindrical plugs 26 projecting from a base plate 28. These may extend to a considerable height, particularly if the process is repeated over several stages.
  • a crossing network of grooves 24 is formed in the bottom side of the base plate 28 opposite the side from which the pins 26 project, as will be explained below.
  • projecting beads 30 are formed in the upper surface of the pedestal 12.
  • Figure 5 depicts the reverse extrusion stage, using a tooling pin array 32 fit with a clearance space into confinement bores 34 formed in a die 36.
  • the pins plugs 26 are slidable into the bores 34. When the pins 32 descend into the bores 34, they encounter the plugs 26, and upon further movement, the plug material is forced upwardly reversely extruded into contact with the walls of the bores 34.
  • FIG. 11-13 show an alternate simplified form of heat sink 50, in which grooves are not formed in the base plate 52, such that convection occurs only on the outside surfaces of the tubes 54.
  • the improved heat sink having air flow passages beneath the base plate can also be produced by an assembly process, although the reverse extrusion process is preferred due to the much lower costs involved.
  • a base plate 56 of aluminum or other suitable material is initially formed with a pattern of crossing groove 58, on one side.
  • a series of counterbore holes 60 is then machined or punched into the base plate 56 aligned the intersection of the grooves 58 ( Figures 15 and 16).
  • a tubular rivet 62 ( Figure 17) is inserted into each counterbored hole 60 and crimped at the surface to the mechanically lock the rivets 62 in a position projecting from the upper side of the base plate 56.
  • FIGs 20-25 show another embodiment in which a relatively thin base plate 66 is formed with tapering holes 68.
  • a series of tubes 70 each have their bottom end 72 formed with a reduced outside diameter to create a shoulder.
  • the tubes 70 are each assembled into a respective one of the holes 68, and then the ends 72 are flared with a tool 74 to be mechanically locked to the plate 66. This creates an array of the tubes 70 projecting from one side of the plate 66 ( Figure 22).
  • a channel member 76 ( Figure 23) having side walls 78 slotted at 79 to accommodate the plate 66 is fabricated, with intermediate ribs 80 defining flow passages 82 on the underside of the plate 66 when the plate 66 is installed in the slotted sides 78.
  • the flow passages 82 communicate with the tube interior to set up a chimney effect.
  • the channel member 76A may be made to accommodate two or more ganged base plates 66 with the tube arrays, to increase the heat transfer capabilities.
  • Figure 26 shows an alternate form of the channel member 84, which is of two piece construction, incorporating the base plate 86 as an integral position. The two pieces 88A, 88B can be interlocked as shown.
  • Figure 27 shows a snap-in rivet 90 performed with a crimp 92, such that they can be assembled by pushing the same into the base plate 56 to establish a snap fit.
  • Figure 28 shows a center plate 94 and outer plate 96 added to the base plate 56. By shifting the center plate 94, deformation of the rivet 64 locks the same in position.
  • Figures 29 and 30 shows a slotted head 98 on a rivet 100, the head 98 of sufficient depth to contact the structure 102 to be cooled, increasing conductive heat transfer.
  • the slots 104 allow air flow into the hollow tube portion of the rivet 100.
  • Figures 31-33 demonstrate the ability of the process of the present invention to provide tubes 106A, 106B of varying height so as to increase heat transfer from the center of the heat sink 108, which is sometimes a desirable feature.

Abstract

A heat sink and method of manufacture is described. In the preferred embodiment, an array of tubes (40) are extruded from a block of conductive metal (10), such as aluminum. A series of plugs or pins (26) are extruded in a first stage, and the plugs (26) are reverse extruded by tooling pins (32) to form tubes (40) of considerable or varying length, integral with the base plate. The tube closed ends are punched so as to form holes (48) through the base plate (28) which has a groove crossing pattern (24) aligned with holes to provide an air convection flow path. The tubes (70) may be assembled to a base (66) as separate elements, and a channel member (76) can also be utilized to provide flow passages extending to each tube.

Description

IMPROVED HEAT SINKAND PROCESS OFMANUFACTURE
Background of the Invention This invention concerns heat sinks of a type widely used for dissipating heat from electronic components by conduction, convection, and radiation. One configuration of a heat sink is shown in U.S. patent 5,781,411 comprised of a base plate having an array of tubes projecting from a base plate, with one or more holes drilled in the sidewall adjacent the bottom of each tube, creating a chimney effect by the upward draft of air flow through the tubes. That heat sink is made by machining material from a molded aluminum piece to form the tubes. This process is relatively costly, which is an important factor for an item produced in vast numbers in the very competitive field of personal computers. U.S. patent 5,369,301 discloses a solid pin array integral with a base plate. The pins are formed by forging, but this process can produce only limited height pins, which in turn limits the ability of the structure to function to dissipate heat. Another drawback of the forging process is that it is difficult to provide varying height pins in an array. It has heretofore been recognized that higher fins or pins at the center of an array may be desirable, as the center area typically tends to be hotter. It is an object of the present invention to provide an improved method of manufacturing a tube array heat sink and an improved heat sink which allows rapid and economical manufacture, while allowing higher and variable height tubular elements, as well as enabling chimney effect air flow through the tubes.
Summary of the Invention The above object and others which will become apparent upon a reading of the following specification and claims, are achieved by a multiple extrusion process, beginning with an initial step of exerting pressure on a confined block of a highly heat conductive metal such as aluminum with a tooling piece having an array of holes extending normally to the block surface. This pressure forces the material from the block up into the holes, resulting in the extrusion of an array of plugs extending from a base plate formed by the remaining unextruded portions of the block. In the next step, a tooling piece comprised of an array of pins is forced into the plugs projecting from the base plate. As the pins are forced into a respective one of the plugs which are disposed in a confinement bore, the material of the plugs is reversely extruded past the pins in being confined by the bore walls, forming a series of hollow or tubular cylinders, closed at one end. Subsequently, a punching process may be also be carried out, forming through holes into the closed end of each tube, creating an open ended array of tubes integral with the base plate, which openings extend completely through the base plate to the opposite side thereof. In order to allow a cooling air flow through the tubes, by the chimney effect a groove pattern may be formed into the opposite side of the plate, preferably during the extrusion of the plugs. The grooves intersect with the holes through the base and tubes, and allow air heated by the structure against which the plate is abutted to flow into and up the tubes by a convection effect. Thus, a heat sink comprised of an array of pins or tubes extending from a base plate to a greater height then heretofore possible may be quickly and economically manufactured. Varying height tubes may also be produced. In addition, a chimney effect may optionally be provided in the tubes without requiring machining of holes in the sidewalk of the tubes by the effect of the groove pattern in the base plate under surface. The tubes may also be assembled to the base and attached by a mechanical connection. Grooves in the base plate allow air flow into the tubes, and a separate channel member can provide air flow passages for the same purpose.
Description of the Drawings Figure 1 is sectional view of a simplified representation of tooling and a metal block in position to be reverse extruded in manufacturing a heat sink. Figure 2 is a sectional view of the tooling shown in Figure 1 with the block extruded into an intermediate form. Figure 3 is a sectional view of the part shown being extruded in Figure 3. Figure 4 is bottom plan view of a part shown in Figure 3. Figure 5 is a sectional view of additional tooling in which a reverse extrusion step is executed causing the pins or plugs initially formed to be reverse extruded to form extended length tubes closed at one end. Figure 6 is a sectional view of the part formed in the extruding step shown in Figure 5. Figure 7 is a sectional view of additional tooling for punching out the closed end of the tubes and forming corresponding holes through the base plate from which the tubes project. Figure 8 is a sectional view of a version of the heat sink according to the present invention produced in the tooling shown in Figure 7. Figure 9 is a bottom plan view of the heat sink shown in Figure 8. Figure 10 is a perspective view of the heat sink shown in Figure 8. Figure 11 is a sectional view of a simplified version of the heat sink. Figure 12 is a perspective view of the part shown in Figure 11. Figure 13 is a plan view of the bottom of the heat sink shown in Figures 1 1 and 12. Figure 14 is a perspective view of a partially formed base plate for use in an assembled version of the heat sink according to the invention. Figure 15 is a perspective view of the base plate shown in Figure 14 with a series of holes formed in the base plate. Figure 16 is a plan bottom view of the base plate shown in Figure 15. Figure 17 is a sectional view of a tubular rivet used to form the tubes in the heat sink according to the invention. Figure 18 is a sectional view of a fragmentary portion of a base plate with a tubular rivet crimped in position. Figure 19 is a perspective view of a completed assembled version of the heat sink according to the present invention. Figure 20 is an exploded perspective view of a second embodiment of the assembled version of the heat sink. Figure 21 is a fragmentary sectional view of an assembled tube and plate. Figure 22 is a fragmentary perspective view of the second embodiment of the assembled version of the heat sink. Figure 23 is a perspective view of an assembled tube array heat sink in which air flow passages are added by installation of the base plate onto a channel member. Figure 24 is a transverse sectional view of the channel member used in the heat sink shown in Figure 23. Figure 25 is a perspective view of the heat sink embodiment shown in Figure 23 with tube arrays ganged together. Figure 26 is a transverse sectional view of an alternate form of the base plate and channel member. Figure 27 is a sectional view of an installed snap-in rivet configuration. Figure 28 is a sectional view of an offset plate rivet connection. Figure 29 is a perspective view of a slotted head rivet configuration. Figure 30 is a sectional view of a slotted head rivet installation. Figure 31 is an elevational view of a heat sink with a varying height tube array in a heat sink. Figure 32 is a plan view of the heat sink shown in Figure 31. Figure 33 is a fragmentary perspective view of the heat sink shown in Figures 31 and 32.
Detailed Description In the following detailed description, certain specific terminology will be employed for the sake of clarity and a particular embodiment described in accordance with the requirements of 35 USC 112, but it is to be understood that the same is not intended to be limiting and should not be so construed inasmuch as the invention is capable of taking many forms and variations within the scope of the appended claims. The present invention utilizes the principle of reverse extrusion to manufacture a tubular array heat sink in order to economically provide such device. The following drawings are not intended to be detailed representations of the tooling or process steps, as these details are well known to those skilled in the art. According to the present invention, an extrudable metal having desirable conductivity characteristics, such as aluminum, is reverse extruded to provide a tubular array heat sink. Aluminum plated with copper is another possibility. As seen in Figure 1, a block 10 of the metal is placed on a pedestal 12 positioned below a confining member 14 mounting a die 16 formed with an array of holes 18 having suitable entryways 20 adjacent its lower face. As seen in Figure 2, the material of the block 10 is extruded upwardly into the holes 18 as the die 16 and confining member 14 descend under very high ram pressure to compress the block 10. An intermediate part 22 is thereby formed (Figure 3), having array of cylindrical plugs 26 projecting from a base plate 28. These may extend to a considerable height, particularly if the process is repeated over several stages. According to one aspect of the present invention, a crossing network of grooves 24 is formed in the bottom side of the base plate 28 opposite the side from which the pins 26 project, as will be explained below. In this case projecting beads 30 are formed in the upper surface of the pedestal 12. These grooves 24 extend across each other as shown in Figure 4. Figure 5 depicts the reverse extrusion stage, using a tooling pin array 32 fit with a clearance space into confinement bores 34 formed in a die 36. The pins plugs 26 are slidable into the bores 34. When the pins 32 descend into the bores 34, they encounter the plugs 26, and upon further movement, the plug material is forced upwardly reversely extruded into contact with the walls of the bores 34. The length achievable is considerable in comparison to the prior art pin forging technique, any may varied by changing the length of the tooling pins 32. The result is an intermediate part 38, which consists of an array of closed end tubes 40 projecting from base plate 28. It is noted that there may be additional incremental intermediate forming steps to complete the extrusion processes shown, in which the forming is carried out more gradually then shown, typically with progressive transfers of the part through various stations whereas partial extrusions are carried out. Also, heating of the block may be necessary in some instances to improve material flow and formability. These particulars are well known to those skilled in the extruding art, and hence will not be here discussed in detail. In order to provide a chimney effect for the tubes 40, an additional step may optionally be carried out, as seen in Figure 7. An array of upwardly projecting punches 42 are slidable in guide bores 44 in a guide block 46. The punches 42 are forced upwardly to form holes through the base plate 28 and end wall of the tubes 40, creating through holes 48. Holes 48 are aligned at the intersection of the grooves 24. This allows heated air to flow into the tubes 40 and rise upwardly by convection, to improve heat transfer from a structure to which the base plate 28 is affixed. Figures 11-13 show an alternate simplified form of heat sink 50, in which grooves are not formed in the base plate 52, such that convection occurs only on the outside surfaces of the tubes 54. The improved heat sink having air flow passages beneath the base plate can also be produced by an assembly process, although the reverse extrusion process is preferred due to the much lower costs involved. Referring to Figures 14-26, such an assembly processes are illustrated. A base plate 56 of aluminum or other suitable material is initially formed with a pattern of crossing groove 58, on one side. A series of counterbore holes 60 is then machined or punched into the base plate 56 aligned the intersection of the grooves 58 (Figures 15 and 16). A tubular rivet 62 (Figure 17) is inserted into each counterbored hole 60 and crimped at the surface to the mechanically lock the rivets 62 in a position projecting from the upper side of the base plate 56. This provides an array of tubes 64 as seen in Figure 19 which communicate with the grooves 58 to establish a chimney effect without requiring machining of the tubes 64. Figures 20-25 show another embodiment in which a relatively thin base plate 66 is formed with tapering holes 68. A series of tubes 70 each have their bottom end 72 formed with a reduced outside diameter to create a shoulder. The tubes 70 are each assembled into a respective one of the holes 68, and then the ends 72 are flared with a tool 74 to be mechanically locked to the plate 66. This creates an array of the tubes 70 projecting from one side of the plate 66 (Figure 22). Next, a channel member 76 (Figure 23) having side walls 78 slotted at 79 to accommodate the plate 66 is fabricated, with intermediate ribs 80 defining flow passages 82 on the underside of the plate 66 when the plate 66 is installed in the slotted sides 78. The flow passages 82 communicate with the tube interior to set up a chimney effect. As seen in Figure 25, the channel member 76A may be made to accommodate two or more ganged base plates 66 with the tube arrays, to increase the heat transfer capabilities. Figure 26 shows an alternate form of the channel member 84, which is of two piece construction, incorporating the base plate 86 as an integral position. The two pieces 88A, 88B can be interlocked as shown. Figure 27 shows a snap-in rivet 90 performed with a crimp 92, such that they can be assembled by pushing the same into the base plate 56 to establish a snap fit. Figure 28 shows a center plate 94 and outer plate 96 added to the base plate 56. By shifting the center plate 94, deformation of the rivet 64 locks the same in position. Figures 29 and 30 shows a slotted head 98 on a rivet 100, the head 98 of sufficient depth to contact the structure 102 to be cooled, increasing conductive heat transfer. The slots 104 allow air flow into the hollow tube portion of the rivet 100. Figures 31-33 demonstrate the ability of the process of the present invention to provide tubes 106A, 106B of varying height so as to increase heat transfer from the center of the heat sink 108, which is sometimes a desirable feature.

Claims

Claims
1. A process for forming a heat sink, comprising the steps of: exerting pressure on a confined block of heat conductive metal with a tooling plate having an array of holes so as to extrude material into said holes, forming an intermediate part comprised of a base plate having an array of plugs projecting from one side.
2. The process according to claim 1 further including the steps of subsequently forcing said intermediate part into an array of tooling pins aligned with said array of plugs so as to force material from said plugs along and around said pins into a clearance space defined by confining cylindrical bores disposed about said plugs and tooling pins so as to reverse extrude an array of tubes projecting from said base plate.
3. The process according to claim 2 further including the step of punching out the bottom of said tubes to form through air passages.
4. The process according to claim 3 further including the steps of forming a cross pattern of bottom grooves on a side of said base plate opposite said side from which said tubes project, said grooves intersecting the open bottom of said tubes in said array to allow air flow into said tubes with said base plate opposite side, to be installed against structure to be cooled.
5. The process according to claim 4 wherein said step of forming said bottom grooves carried out simultaneously with said formation of said array of plugs projecting from said base plate.
6. A process for forming a heat sink comprised of an array of tubes projecting from one side of a base plate, said method enabling a chimney effect air flow to take place through said tubes, said method including forming a pattern of through holes in said base plate, each opening into a respective of said tubes in said array; and, forming a crossing groove pattern on an opposite side of base plates intersecting said through holes in said base plate, whereby air flow along said grooves and into said holes may be induced by heating of said base plate by a structure to be cooled.
7. The process according to claim 6 wherein said tubes are reverse extruded from a base plate.
8. The process according to claim 6 wherein said tubes are assembled to said base plate.
9. The process according to claim 8 wherein said tubes are comprised of tubular rivets crimped to said base plate.
10. The process according to claim 8 wherein said tubes are flared at one end to be mechanically attached to said base plate.
11. The process according to claim 6 wherein said groove pattern is formed into said base plate opposite side as said tubes are reverse extruded from said base plate.
12. A heat sink comprising: a base member of a heat conductive material; an array of tubes projecting from one side of said base plate, each of said tubes aligned with corresponding holes in said base member; and, a series of flow passages defined in part by an opposite side of said base member and communicating with said holes in said base member, whereby a chimney effect is achieved by air flow induced through said flow passages and up said tubes.
13. The heat sink according to claim 12 wherein said flow passages are defined in part by a crossing pattern of grooves formed into said opposite side of said base plate.
14. The heat sink according to claim 12 wherein said flow passages are defined in part by a channel member mounted beneath said base plate.
15. The heat sink according to claim 14 wherein said channel member is formed with a series of ribs overlain by said base plate to define said flow passages.
PCT/US1999/025193 1998-10-29 1999-10-27 Improved heat sink and process of manufacture WO2000033622A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU35799/00A AU3579900A (en) 1998-10-29 1999-10-27 Improved heat sink and process of manufacture

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WO2003053118A3 (en) * 2001-12-18 2003-11-06 Fotec Forschungs Und Technolog Cooling device for a chip and method for production thereof
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AT514053A1 (en) * 2013-02-26 2014-09-15 Neuman Aluminium Fliesspresswerk Gmbh Method for producing a heat sink and heat sink for electrical components
WO2015010872A1 (en) * 2013-07-25 2015-01-29 Robert Bosch Gmbh Cooling body
DE102017004079A1 (en) * 2017-04-25 2018-10-25 Neuman Aluminium Fliesspresswerk Gmbh Process for forming a molded part and molded part

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